different model has different module cameras, the following is the details:
VT-GTC8181:FCB-EX45CP:18x opticalzoom*12x digitalzoom, color
VT-GTC8182:FCB-EX480CP:18x opticalzoom*12x digitalzoom, day&night
VT-GTC8261:FCB-EX980P:26x opticalzoom*12x digitalzoom, day&night
VT-GTC8361:FCB-EX1000P:36x opticalzoom*12x digitalzoom, day&night
VT-GTC8231:VK-S454ER:23x opticalzoom*10x digitalzoom, day&night,WDR,progressive scan, digital shutter
VT-GTC8271:LG-327:27x opticalzoom*10x digitalzoom, day&night,IR induction
VT-GTC8272:LG-627:27x opticalzoom*10x digitalzoom, day&night
Dome Drive Unit:
1. 360°continuous pan, 180°Tilt "Auto Flip"
2. Discreet Liner with Sealed Fixed Bubble
3. 220 presets, about 0. 1'°preset accuracy
4. 300°/s Pan/Tilt Preset Speed
5. 4 tours max. 27 presets/tour
6. 4 patterns, 4 cruises, 8 titled zones
7. 8 privacy mask
8. OSD Menu password protection
9. Built-in alarm, 7 input/2 output
10. Multiple RS485 protocol/Coaxial
11. Locations of Labels and On-Screen Displays
12. Software Up-gradable
13. FIFO alarm priority levels
14. Alarm driven Pattern, preset etc.
15. Position Resume After Alarm
16. Variable Cruise Speed 0. 1-150°/sec
17. OSD Menu for Programmable Functions
18. Proportional Pan/Tilt Speed
19. Vertical Tilt Unobstructed 0° to -90°
20. Auto Running Memory Against Power Outage
21. Auto Running Resume after Manual Operation
22. System preheat before camera power on
23. On-Screen display for compass and tilt angle, System and environment temperature, fan status
Electrical:
1. Input Voltage 16-30 VAC; 24 VAC nominal
2. Input Power 10 VA nominal (w/o heater)
3. 45 VA nominal (with heater)
4. Fuse 1. 25A
5. Auxiliary Outputs 2 Alarm Inputs 7
6. Built-in Surge Protection
7. Limited Lightning Protection